English

Higher structure maps for free resolutions of length 3 and linkage

Commutative Algebra 2023-03-16 v3

Abstract

Let II be a perfect ideal of height 3 in a Gorenstein local ring RR. Let F\mathbb{F} be the minimal free resolution of II. A sequence of linear maps, which generalize the multiplicative structure of F\mathbb{F}, can be defined using the generic ring associated to the format of F\mathbb{F}. Let JJ be an ideal linked to II. We provide formulas to compute some of these maps for the free resolution of JJ in terms of those of the free resolution of II. We apply our results to describe classes of licci ideals, showing that a perfect ideal with Betti numbers (1,5,6,2)(1,5,6,2) is licci if and only if at least one of these maps is nonzero modulo the maximal ideal of RR.

Keywords

Cite

@article{arxiv.2208.05934,
  title  = {Higher structure maps for free resolutions of length 3 and linkage},
  author = {Lorenzo Guerrieri and Xianglong Ni and Jerzy Weyman},
  journal= {arXiv preprint arXiv:2208.05934},
  year   = {2023}
}

Comments

33 pages